Jumper Configuration; Copper Jumpers; Traditional Pin Header Jumpers; Figure 6. Copper Jumpers - Renesas RA8 Series User Manual

Renesas RA Family

4.3 Jumper Configuration

Two types of jumpers are provided on the EK-RA8M1 board.
1. Copper jumpers (trace-cut type and solder bridge type)

2. Traditional pin header jumpers

The following sections describe each type and their default configuration.

4.3.1 Copper Jumpers

Copper jumpers are of two types, designated trace-cut and solder-bridge.
A trace-cut jumper is provided with a narrow copper trace connecting its pads. The silk screen overlay
printing around a trace-cut jumper is a solid box. To isolate the pads, cut the trace between pads adjacent to
each pad, then remove the connecting copper foil either mechanically or with the assistance of heat. Once
the etched copper trace is removed, the trace-cut jumper is turned into a solder-bridge jumper for any later
changes.
A solder-bridge jumper is provided with two isolated pads that may be joined together by one of three
methods:
Solder may be applied to both pads to develop a bulge on each and the bulges joined by touching a
•
soldering iron across the two pads.
• A small wire may be placed across the two pads and soldered in place.
• A SMT resistor, size 0805, 0603 or 0402, may be placed across the two pads and soldered in place. A
zero-ohm resistor shorts the pads together.
For any copper jumper, the connection is considered closed if there is an electrical connection between the
pads (default for trace-cut jumpers). The connection is considered open if there is no electrical connection
between the pads (default for the solder-bridge jumpers.)
4.3.2 Traditional Pin Header Jumpers
These jumpers are traditional small pitch jumpers that require an external shunt to open/close them. The
traditional pin jumpers on the EK-RA8M1 board are 2 mm pitch headers and require compatible 2 mm shunt
jumpers.
R20UT5149EG0100 Rev 1.00
Oct.03.23

Figure 6. Copper Jumpers

EK-RA8M1 v1 – User's Manual
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